Spectral Engineering via Complex Patterns of Circular Nano-object Miniarrays: I. Convex Patterns Tunable by Integrated L
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Spectral Engineering via Complex Patterns of Circular Nano-object Miniarrays: I. Convex Patterns Tunable by Integrated Lithography Realized by Circularly Polarized Light ´ ´ 2 · Oliver ´ A. Fekete2 · Maria ´ Csete2 Aron Sipos1 · Emese Toth Received: 8 April 2020 / Accepted: 15 July 2020 © The Author(s) 2020
Abstract Illumination of colloid sphere monolayers by circularly polarized beams enables the fabrication of concave patterns composed of circular nanohole miniarrays that can be transferred into convex metal nano-object patterns via a lift-off procedure. Unique spectral and near-field properties are achievable by controlling the geometry of the central nanoring and quadrumer of slightly rotated satellite nanocrescents and by selecting those azimuthal orientations that promote localized plasmon resonances. The spectral and near-field effects of hexagonal patterns composed of uniform gold nanorings and nanocrescents, which can be prepared by transferring masks fabricated by a perpendicularly and obliquely incident single homogeneous circularly polarized beam, were studied to uncover the supported localized plasmonic modes. Artificial rectangular patterns composed of a singlet nanoring and singlet nanocrescent as well as quadrumer of four nanocrescents were investigated to analyze the effect of nano-object interactions and lattice type. It was proven that all nanophotonical phenomena are governed by the azimuthal orientation independent localized resonance on the nanorings and by the C2, C1, ¯ and U resonances on the nanocrescents in case of E-field direction perpendicular and parallel to their symmetry axes. The interaction between localized surface plasmon resonances on individual nano-objects is weak, whereas scattered photonic modes have a perturbative role at the Rayleigh anomaly only on the larger periodic rectangular pattern of miniarrays. Considerable fluorescence enhancement of dipolar emitters is achievable at spectral locations promoting the C and U resonances on the constituent nano-object. Keywords Spectral engineering · Nanoplasmonics · Convex nanoparticle patterns · Localized surface plasmon resonance · Rayleigh anomaly · Fluorescence enhancement of dipolar emitters · Tunable spectral properties · Tunable near-field properties
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11468-020-01235-2) contains supplementary material, which is available to authorized users. M´aria Csete
[email protected] ´ Aron Sipos [email protected] 1
Institute of Biophysics, Biological Research Centre, Szeged, Temesv´ari krt. 62, H-6726, Hungary
2
Department of Optics and Quantum Electronics, University of Szeged, Szeged, D´om t´er 9, H-6720, Hungary
Introduction Investigation of individual and periodic plasmonic structures initialized the inspection of complex patterns composed of metal nano-objects, which have interesting synergetic near-field and spectral properties. The building blocks of these structures are usually uniform nano-objects, and the array optic
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